I don’t know _________.
A．whattodoitB．howtodoC．whattodoD．todowhat
C
考查非謂語動詞. 疑問詞加不定式作用相當于一個賓語從句，句意:我不知道做什么.選項AD結(jié)構(gòu)有誤,選項Bhow不能做賓語,故選C.
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